/*  $NetBSD: icmp6.h,v 1.47 2013/07/01 12:43:15 christos Exp $  */
/*  $KAME: icmp6.h,v 1.84 2003/04/23 10:26:51 itojun Exp $  */


/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1986, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *  @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
 */

#ifndef _NETINET_ICMP6_H_
#define _NETINET_ICMP6_H_

#include <netinet/in.h> /* android-added: glibc source compatibility. */

#define ICMPV6_PLD_MAXLEN   1232    /* IPV6_MMTU - sizeof(struct ip6_hdr)
                       - sizeof(struct icmp6_hdr) */

struct icmp6_hdr {
    u_int8_t    icmp6_type; /* type field */
    u_int8_t    icmp6_code; /* code field */
    u_int16_t   icmp6_cksum;    /* checksum field */
    union {
        u_int32_t   icmp6_un_data32[1]; /* type-specific field */
        u_int16_t   icmp6_un_data16[2]; /* type-specific field */
        u_int8_t    icmp6_un_data8[4];  /* type-specific field */
    } icmp6_dataun;
} __packed;

#define icmp6_data32    icmp6_dataun.icmp6_un_data32
#define icmp6_data16    icmp6_dataun.icmp6_un_data16
#define icmp6_data8 icmp6_dataun.icmp6_un_data8
#define icmp6_pptr  icmp6_data32[0]     /* parameter prob */
#define icmp6_mtu   icmp6_data32[0]     /* packet too big */
#define icmp6_id    icmp6_data16[0]     /* echo request/reply */
#define icmp6_seq   icmp6_data16[1]     /* echo request/reply */
#define icmp6_maxdelay  icmp6_data16[0]     /* mcast group membership */

#define ICMP6_DST_UNREACH       1   /* dest unreachable, codes: */
#define ICMP6_PACKET_TOO_BIG        2   /* packet too big */
#define ICMP6_TIME_EXCEEDED     3   /* time exceeded, code: */
#define ICMP6_PARAM_PROB        4   /* ip6 header bad */

#define ICMP6_ECHO_REQUEST      128 /* echo service */
#define ICMP6_ECHO_REPLY        129 /* echo reply */
#define MLD_LISTENER_QUERY      130     /* multicast listener query */
#define MLD_LISTENER_REPORT     131 /* multicast listener report */
#define MLD_LISTENER_DONE       132 /* multicast listener done */
#define MLD_LISTENER_REDUCTION MLD_LISTENER_DONE /* RFC3542 definition */

/* RFC2292 decls */
#define ICMP6_MEMBERSHIP_QUERY      130 /* group membership query */
#define ICMP6_MEMBERSHIP_REPORT     131 /* group membership report */
#define ICMP6_MEMBERSHIP_REDUCTION  132 /* group membership termination */

#ifndef _KERNEL
/* the followings are for backward compatibility to old KAME apps. */
#define MLD6_LISTENER_QUERY MLD_LISTENER_QUERY
#define MLD6_LISTENER_REPORT    MLD_LISTENER_REPORT
#define MLD6_LISTENER_DONE  MLD_LISTENER_DONE
#endif

#define ND_ROUTER_SOLICIT       133 /* router solicitation */
#define ND_ROUTER_ADVERT        134 /* router advertisement */
#define ND_NEIGHBOR_SOLICIT     135 /* neighbor solicitation */
#define ND_NEIGHBOR_ADVERT      136 /* neighbor advertisement */
#define ND_REDIRECT         137 /* redirect */

#define ICMP6_ROUTER_RENUMBERING    138 /* router renumbering */

#define ICMP6_WRUREQUEST        139 /* who are you request */
#define ICMP6_WRUREPLY          140 /* who are you reply */
#define ICMP6_FQDN_QUERY        139 /* FQDN query */
#define ICMP6_FQDN_REPLY        140 /* FQDN reply */
#define ICMP6_NI_QUERY          139 /* node information request */
#define ICMP6_NI_REPLY          140 /* node information reply */
#define MLDV2_LISTENER_REPORT       143 /* RFC3810 listener report */

/* The definitions below are experimental. TBA */
#define MLD_MTRACE_RESP         200 /* mtrace response(to sender) */
#define MLD_MTRACE          201 /* mtrace messages */

#ifndef _KERNEL
/* the followings are for backward compatibility to old KAME apps. */
#define MLD6_MTRACE_RESP    MLD_MTRACE_RESP
#define MLD6_MTRACE     MLD_MTRACE
#endif

#define ICMP6_MAXTYPE           201

#define ICMP6_DST_UNREACH_NOROUTE   0   /* no route to destination */
#define ICMP6_DST_UNREACH_ADMIN     1   /* administratively prohibited */
#define ICMP6_DST_UNREACH_NOTNEIGHBOR   2   /* not a neighbor(obsolete) */
#define ICMP6_DST_UNREACH_BEYONDSCOPE   2   /* beyond scope of source address */
#define ICMP6_DST_UNREACH_ADDR      3   /* address unreachable */
#define ICMP6_DST_UNREACH_NOPORT    4   /* port unreachable */
#define ICMP6_DST_UNREACH_POLICY    5   /* source address failed ingress/egress policy */
#define ICMP6_DST_UNREACH_REJROUTE  6   /* reject route to destination */
#define ICMP6_DST_UNREACH_SOURCERT  7   /* error in source routing header */

#define ICMP6_TIME_EXCEED_TRANSIT   0   /* ttl==0 in transit */
#define ICMP6_TIME_EXCEED_REASSEMBLY    1   /* ttl==0 in reass */

#define ICMP6_PARAMPROB_HEADER      0   /* erroneous header field */
#define ICMP6_PARAMPROB_NEXTHEADER  1   /* unrecognized next header */
#define ICMP6_PARAMPROB_OPTION      2   /* unrecognized option */

#define ICMP6_INFOMSG_MASK      0x80    /* all informational messages */

#define ICMP6_NI_SUBJ_IPV6  0   /* Query Subject is an IPv6 address */
#define ICMP6_NI_SUBJ_FQDN  1   /* Query Subject is a Domain name */
#define ICMP6_NI_SUBJ_IPV4  2   /* Query Subject is an IPv4 address */

#define ICMP6_NI_SUCCESS    0   /* node information successful reply */
#define ICMP6_NI_REFUSED    1   /* node information request is refused */
#define ICMP6_NI_UNKNOWN    2   /* unknown Qtype */

#define ICMP6_ROUTER_RENUMBERING_COMMAND  0 /* rr command */
#define ICMP6_ROUTER_RENUMBERING_RESULT   1 /* rr result */
#define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET   255 /* rr seq num reset */

/* Used in kernel only */
#define ND_REDIRECT_ONLINK  0   /* redirect to an on-link node */
#define ND_REDIRECT_ROUTER  1   /* redirect to a better router */

/*
 * Multicast Listener Discovery
 */
struct mld_hdr {
    struct icmp6_hdr    mld_icmp6_hdr;
    struct in6_addr     mld_addr; /* multicast address */
} __packed;

/* definitions to provide backward compatibility to old KAME applications */
#ifndef _KERNEL
#define mld6_hdr    mld_hdr
#define mld6_type   mld_type
#define mld6_code   mld_code
#define mld6_cksum  mld_cksum
#define mld6_maxdelay   mld_maxdelay
#define mld6_reserved   mld_reserved
#define mld6_addr   mld_addr
#endif

/* shortcut macro definitions */
#define mld_type    mld_icmp6_hdr.icmp6_type
#define mld_code    mld_icmp6_hdr.icmp6_code
#define mld_cksum   mld_icmp6_hdr.icmp6_cksum
#define mld_maxdelay    mld_icmp6_hdr.icmp6_data16[0]
#define mld_reserved    mld_icmp6_hdr.icmp6_data16[1]

#define MLD_MINLEN          24

/*
 * Neighbor Discovery
 */

struct nd_router_solicit {  /* router solicitation */
    struct icmp6_hdr    nd_rs_hdr;
    /* could be followed by options */
} __packed;

#define nd_rs_type  nd_rs_hdr.icmp6_type
#define nd_rs_code  nd_rs_hdr.icmp6_code
#define nd_rs_cksum nd_rs_hdr.icmp6_cksum
#define nd_rs_reserved  nd_rs_hdr.icmp6_data32[0]

struct nd_router_advert {   /* router advertisement */
    struct icmp6_hdr    nd_ra_hdr;
    u_int32_t       nd_ra_reachable;    /* reachable time */
    u_int32_t       nd_ra_retransmit;   /* retransmit timer */
    /* could be followed by options */
} __packed;

#define nd_ra_type      nd_ra_hdr.icmp6_type
#define nd_ra_code      nd_ra_hdr.icmp6_code
#define nd_ra_cksum     nd_ra_hdr.icmp6_cksum
#define nd_ra_curhoplimit   nd_ra_hdr.icmp6_data8[0]
#define nd_ra_flags_reserved    nd_ra_hdr.icmp6_data8[1]
#define ND_RA_FLAG_MANAGED  0x80
#define ND_RA_FLAG_OTHER    0x40
#define ND_RA_FLAG_HOME_AGENT   0x20

/*
 * Router preference values based on RFC4191.
 */
#define ND_RA_FLAG_RTPREF_MASK  0x18 /* 00011000 */

#define ND_RA_FLAG_RTPREF_HIGH  0x08 /* 00001000 */
#define ND_RA_FLAG_RTPREF_MEDIUM    0x00 /* 00000000 */
#define ND_RA_FLAG_RTPREF_LOW   0x18 /* 00011000 */
#define ND_RA_FLAG_RTPREF_RSV   0x10 /* 00010000 */

#define nd_ra_router_lifetime   nd_ra_hdr.icmp6_data16[1]

struct nd_neighbor_solicit {    /* neighbor solicitation */
    struct icmp6_hdr    nd_ns_hdr;
    struct in6_addr     nd_ns_target;   /*target address */
    /* could be followed by options */
} __packed;

#define nd_ns_type      nd_ns_hdr.icmp6_type
#define nd_ns_code      nd_ns_hdr.icmp6_code
#define nd_ns_cksum     nd_ns_hdr.icmp6_cksum
#define nd_ns_reserved      nd_ns_hdr.icmp6_data32[0]

struct nd_neighbor_advert { /* neighbor advertisement */
    struct icmp6_hdr    nd_na_hdr;
    struct in6_addr     nd_na_target;   /* target address */
    /* could be followed by options */
} __packed;

#define nd_na_type      nd_na_hdr.icmp6_type
#define nd_na_code      nd_na_hdr.icmp6_code
#define nd_na_cksum     nd_na_hdr.icmp6_cksum
#define nd_na_flags_reserved    nd_na_hdr.icmp6_data32[0]
#if BYTE_ORDER == BIG_ENDIAN
#define ND_NA_FLAG_ROUTER       0x80000000
#define ND_NA_FLAG_SOLICITED        0x40000000
#define ND_NA_FLAG_OVERRIDE     0x20000000
#else
#if BYTE_ORDER == LITTLE_ENDIAN
#define ND_NA_FLAG_ROUTER       0x80
#define ND_NA_FLAG_SOLICITED        0x40
#define ND_NA_FLAG_OVERRIDE     0x20
#endif
#endif

struct nd_redirect {        /* redirect */
    struct icmp6_hdr    nd_rd_hdr;
    struct in6_addr     nd_rd_target;   /* target address */
    struct in6_addr     nd_rd_dst;  /* destination address */
    /* could be followed by options */
} __packed;

#define nd_rd_type      nd_rd_hdr.icmp6_type
#define nd_rd_code      nd_rd_hdr.icmp6_code
#define nd_rd_cksum     nd_rd_hdr.icmp6_cksum
#define nd_rd_reserved      nd_rd_hdr.icmp6_data32[0]

struct nd_opt_hdr {     /* Neighbor discovery option header */
    u_int8_t    nd_opt_type;
    u_int8_t    nd_opt_len;
    /* followed by option specific data*/
} __packed;

#define ND_OPT_SOURCE_LINKADDR      1
#define ND_OPT_TARGET_LINKADDR      2
#define ND_OPT_PREFIX_INFORMATION   3
#define ND_OPT_REDIRECTED_HEADER    4
#define ND_OPT_MTU          5
#define ND_OPT_ADVINTERVAL      7
#define ND_OPT_HOMEAGENT_INFO       8
#define ND_OPT_SOURCE_ADDRLIST      9
#define ND_OPT_TARGET_ADDRLIST      10
#define ND_OPT_MAP          23  /* RFC 5380 */
#define ND_OPT_ROUTE_INFO       24  /* RFC 4191 */
#define ND_OPT_RDNSS            25  /* RFC 6016 */
#define ND_OPT_DNSSL            31  /* RFC 6016 */

struct nd_opt_route_info {  /* route info */
    u_int8_t    nd_opt_rti_type;
    u_int8_t    nd_opt_rti_len;
    u_int8_t    nd_opt_rti_prefixlen;
    u_int8_t    nd_opt_rti_flags;
    u_int32_t   nd_opt_rti_lifetime;
    /* prefix follows */
};

struct nd_opt_prefix_info { /* prefix information */
    u_int8_t    nd_opt_pi_type;
    u_int8_t    nd_opt_pi_len;
    u_int8_t    nd_opt_pi_prefix_len;
    u_int8_t    nd_opt_pi_flags_reserved;
    u_int32_t   nd_opt_pi_valid_time;
    u_int32_t   nd_opt_pi_preferred_time;
    u_int32_t   nd_opt_pi_reserved2;
    struct in6_addr nd_opt_pi_prefix;
} __packed;

#define ND_OPT_PI_FLAG_ONLINK       0x80
#define ND_OPT_PI_FLAG_AUTO     0x40

struct nd_opt_rd_hdr {      /* redirected header */
    u_int8_t    nd_opt_rh_type;
    u_int8_t    nd_opt_rh_len;
    u_int16_t   nd_opt_rh_reserved1;
    u_int32_t   nd_opt_rh_reserved2;
    /* followed by IP header and data */
} __packed;

struct nd_opt_mtu {     /* MTU option */
    u_int8_t    nd_opt_mtu_type;
    u_int8_t    nd_opt_mtu_len;
    u_int16_t   nd_opt_mtu_reserved;
    u_int32_t   nd_opt_mtu_mtu;
} __packed;

struct nd_opt_rdnss {       /* RDNSS option RFC 6106 */
    u_int8_t    nd_opt_rdnss_type;
    u_int8_t    nd_opt_rdnss_len;
    u_int16_t   nd_opt_rdnss_reserved;
    u_int32_t   nd_opt_rdnss_lifetime;
    /* followed by list of IP prefixes */
} __packed;

struct nd_opt_dnssl {       /* DNSSL option RFC 6106 */
    u_int8_t    nd_opt_dnssl_type;
    u_int8_t    nd_opt_dnssl_len;
    u_int16_t   nd_opt_dnssl_reserved;
    u_int32_t   nd_opt_dnssl_lifetime;
    /* followed by list of IP prefixes */
} __packed;

/*
 * icmp6 namelookup
 */

struct icmp6_namelookup {
    struct icmp6_hdr    icmp6_nl_hdr;
    u_int8_t    icmp6_nl_nonce[8];
    int32_t     icmp6_nl_ttl;
    /* could be followed by options */
} __packed;

/*
 * icmp6 node information
 */
struct icmp6_nodeinfo {
    struct icmp6_hdr icmp6_ni_hdr;
    u_int8_t icmp6_ni_nonce[8];
    /* could be followed by reply data */
} __packed;

/*
 * BEGIN android-removed: glibc doesn't have these, and external/ping declares them itself.
#define ni_type     icmp6_ni_hdr.icmp6_type
#define ni_code     icmp6_ni_hdr.icmp6_code
#define ni_cksum    icmp6_ni_hdr.icmp6_cksum
#define ni_qtype    icmp6_ni_hdr.icmp6_data16[0]
#define ni_flags    icmp6_ni_hdr.icmp6_data16[1]
 * END android-removed
 */

#define NI_QTYPE_NOOP       0 /* NOOP  */
#define NI_QTYPE_SUPTYPES   1 /* Supported Qtypes */
#define NI_QTYPE_FQDN       2 /* FQDN (draft 04) */
#define NI_QTYPE_DNSNAME    2 /* DNS Name */
#define NI_QTYPE_NODEADDR   3 /* Node Addresses */
#define NI_QTYPE_IPV4ADDR   4 /* IPv4 Addresses */

#if BYTE_ORDER == BIG_ENDIAN
#define NI_SUPTYPE_FLAG_COMPRESS    0x1
#define NI_FQDN_FLAG_VALIDTTL       0x1
#elif BYTE_ORDER == LITTLE_ENDIAN
#define NI_SUPTYPE_FLAG_COMPRESS    0x0100
#define NI_FQDN_FLAG_VALIDTTL       0x0100
#endif

#ifdef NAME_LOOKUPS_04
#if BYTE_ORDER == BIG_ENDIAN
#define NI_NODEADDR_FLAG_LINKLOCAL  0x1
#define NI_NODEADDR_FLAG_SITELOCAL  0x2
#define NI_NODEADDR_FLAG_GLOBAL     0x4
#define NI_NODEADDR_FLAG_ALL        0x8
#define NI_NODEADDR_FLAG_TRUNCATE   0x10
#define NI_NODEADDR_FLAG_ANYCAST    0x20 /* just experimental. not in spec */
#elif BYTE_ORDER == LITTLE_ENDIAN
#define NI_NODEADDR_FLAG_LINKLOCAL  0x0100
#define NI_NODEADDR_FLAG_SITELOCAL  0x0200
#define NI_NODEADDR_FLAG_GLOBAL     0x0400
#define NI_NODEADDR_FLAG_ALL        0x0800
#define NI_NODEADDR_FLAG_TRUNCATE   0x1000
#define NI_NODEADDR_FLAG_ANYCAST    0x2000 /* just experimental. not in spec */
#endif
#else  /* draft-ietf-ipngwg-icmp-name-lookups-05 (and later?) */
#if BYTE_ORDER == BIG_ENDIAN
#define NI_NODEADDR_FLAG_TRUNCATE   0x1
#define NI_NODEADDR_FLAG_ALL        0x2
#define NI_NODEADDR_FLAG_COMPAT     0x4
#define NI_NODEADDR_FLAG_LINKLOCAL  0x8
#define NI_NODEADDR_FLAG_SITELOCAL  0x10
#define NI_NODEADDR_FLAG_GLOBAL     0x20
#define NI_NODEADDR_FLAG_ANYCAST    0x40 /* just experimental. not in spec */
#elif BYTE_ORDER == LITTLE_ENDIAN
#define NI_NODEADDR_FLAG_TRUNCATE   0x0100
#define NI_NODEADDR_FLAG_ALL        0x0200
#define NI_NODEADDR_FLAG_COMPAT     0x0400
#define NI_NODEADDR_FLAG_LINKLOCAL  0x0800
#define NI_NODEADDR_FLAG_SITELOCAL  0x1000
#define NI_NODEADDR_FLAG_GLOBAL     0x2000
#define NI_NODEADDR_FLAG_ANYCAST    0x4000 /* just experimental. not in spec */
#endif
#endif

struct ni_reply_fqdn {
    u_int32_t ni_fqdn_ttl;  /* TTL */
    u_int8_t ni_fqdn_namelen; /* length in octets of the FQDN */
    u_int8_t ni_fqdn_name[3]; /* XXX: alignment */
} __packed;

/*
 * Router Renumbering. as router-renum-08.txt
 */
struct icmp6_router_renum { /* router renumbering header */
    struct icmp6_hdr    rr_hdr;
    u_int8_t    rr_segnum;
    u_int8_t    rr_flags;
    u_int16_t   rr_maxdelay;
    u_int32_t   rr_reserved;
} __packed;

#define ICMP6_RR_FLAGS_TEST     0x80
#define ICMP6_RR_FLAGS_REQRESULT    0x40
#define ICMP6_RR_FLAGS_FORCEAPPLY   0x20
#define ICMP6_RR_FLAGS_SPECSITE     0x10
#define ICMP6_RR_FLAGS_PREVDONE     0x08

#define rr_type     rr_hdr.icmp6_type
#define rr_code     rr_hdr.icmp6_code
#define rr_cksum    rr_hdr.icmp6_cksum
#define rr_seqnum   rr_hdr.icmp6_data32[0]

struct rr_pco_match {       /* match prefix part */
    u_int8_t    rpm_code;
    u_int8_t    rpm_len;
    u_int8_t    rpm_ordinal;
    u_int8_t    rpm_matchlen;
    u_int8_t    rpm_minlen;
    u_int8_t    rpm_maxlen;
    u_int16_t   rpm_reserved;
    struct  in6_addr    rpm_prefix;
} __packed;

#define RPM_PCO_ADD     1
#define RPM_PCO_CHANGE      2
#define RPM_PCO_SETGLOBAL   3
#define RPM_PCO_MAX     4

struct rr_pco_use {     /* use prefix part */
    u_int8_t    rpu_uselen;
    u_int8_t    rpu_keeplen;
    u_int8_t    rpu_ramask;
    u_int8_t    rpu_raflags;
    u_int32_t   rpu_vltime;
    u_int32_t   rpu_pltime;
    u_int32_t   rpu_flags;
    struct  in6_addr rpu_prefix;
} __packed;
#define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK  0x80
#define ICMP6_RR_PCOUSE_RAFLAGS_AUTO    0x40

#if BYTE_ORDER == BIG_ENDIAN
#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80000000
#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40000000
#elif BYTE_ORDER == LITTLE_ENDIAN
#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80
#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40
#endif

struct rr_result {      /* router renumbering result message */
    u_int16_t   rrr_flags;
    u_int8_t    rrr_ordinal;
    u_int8_t    rrr_matchedlen;
    u_int32_t   rrr_ifid;
    struct  in6_addr rrr_prefix;
} __packed;
#if BYTE_ORDER == BIG_ENDIAN
#define ICMP6_RR_RESULT_FLAGS_OOB       0x0002
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN     0x0001
#elif BYTE_ORDER == LITTLE_ENDIAN
#define ICMP6_RR_RESULT_FLAGS_OOB       0x0200
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN     0x0100
#endif

/*
 * icmp6 filter structures.
 */

struct icmp6_filter {
    u_int32_t icmp6_filt[8];
};

/*
 * BEGIN android-changed
 * Linux and *BSD kernels use opposite values to indicate pass/block in ICMPv6
 * filters, and assign a different value to the ICMP6_FILTER sockopt.
 */
#define ICMP6_FILTER 1

#define ICMP6_FILTER_SETPASSALL(filterp) \
    (void)memset(filterp, 0x00, sizeof(struct icmp6_filter))
#define ICMP6_FILTER_SETBLOCKALL(filterp) \
    (void)memset(filterp, 0xff, sizeof(struct icmp6_filter))
#define ICMP6_FILTER_SETPASS(type, filterp) \
    (((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31)))
#define ICMP6_FILTER_SETBLOCK(type, filterp) \
    (((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))
#define ICMP6_FILTER_WILLPASS(type, filterp) \
    ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0)
#define ICMP6_FILTER_WILLBLOCK(type, filterp) \
    ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0)
/*
 * END android-changed
 */

/*
 * Variables related to this implementation
 * of the internet control message protocol version 6.
 */

/*
 * IPv6 ICMP statistics.
 * Each counter is an unsigned 64-bit value.
 */
#define ICMP6_STAT_ERROR    0   /* # of calls to icmp6_error */
#define ICMP6_STAT_CANTERROR    1   /* no error (old was icmp) */
#define ICMP6_STAT_TOOFREQ  2   /* no error (rate limitation) */
#define ICMP6_STAT_OUTHIST  3   /* # of output messages */
        /* space for 256 counters */
#define ICMP6_STAT_BADCODE  259 /* icmp6_code out of range */
#define ICMP6_STAT_TOOSHORT 260 /* packet < sizeof(struct icmp6_hdr) */
#define ICMP6_STAT_CHECKSUM 261 /* bad checksum */
#define ICMP6_STAT_BADLEN   262 /* calculated bound mismatch */
    /*
     * number of responses; this member is inherited from the netinet code,
     * but for netinet6 code, it is already available in outhist[].
     */
#define ICMP6_STAT_REFLECT  263
#define ICMP6_STAT_INHIST   264 /* # of input messages */
        /* space for 256 counters */
#define ICMP6_STAT_ND_TOOMANYOPT 520    /* too many ND options */
#define ICMP6_STAT_OUTERRHIST   521
        /* space for 13 counters */
#define ICMP6_STAT_PMTUCHG  534 /* path MTU changes */
#define ICMP6_STAT_ND_BADOPT    535 /* bad ND options */
#define ICMP6_STAT_BADNS    536 /* bad neighbor solicititation */
#define ICMP6_STAT_BADNA    537 /* bad neighbor advertisement */
#define ICMP6_STAT_BADRS    538 /* bad router solicitiation */
#define ICMP6_STAT_BADRA    539 /* bad router advertisement */
#define ICMP6_STAT_BADREDIRECT  540 /* bad redirect message */
#define ICMP6_STAT_DROPPED_RAROUTE 541  /* discarded routes from router advertisement */

#define ICMP6_NSTATS        542

#define ICMP6_ERRSTAT_DST_UNREACH_NOROUTE   0
#define ICMP6_ERRSTAT_DST_UNREACH_ADMIN     1
#define ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE   2
#define ICMP6_ERRSTAT_DST_UNREACH_ADDR      3
#define ICMP6_ERRSTAT_DST_UNREACH_NOPORT    4
#define ICMP6_ERRSTAT_PACKET_TOO_BIG        5
#define ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT   6
#define ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY    7
#define ICMP6_ERRSTAT_PARAMPROB_HEADER      8
#define ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER  9
#define ICMP6_ERRSTAT_PARAMPROB_OPTION      10
#define ICMP6_ERRSTAT_REDIRECT          11
#define ICMP6_ERRSTAT_UNKNOWN           12

/*
 * Names for ICMP sysctl objects
 */
#define ICMPV6CTL_STATS     1
#define ICMPV6CTL_REDIRACCEPT   2   /* accept/process redirects */
#define ICMPV6CTL_REDIRTIMEOUT  3   /* redirect cache time */
#define ICMPV6CTL_ND6_PRUNE 6
#define ICMPV6CTL_ND6_DELAY 8
#define ICMPV6CTL_ND6_UMAXTRIES 9
#define ICMPV6CTL_ND6_MMAXTRIES     10
#define ICMPV6CTL_ND6_USELOOPBACK   11
/*#define ICMPV6CTL_ND6_PROXYALL    12  obsoleted, do not reuse here */
#define ICMPV6CTL_NODEINFO  13
#define ICMPV6CTL_ERRPPSLIMIT   14  /* ICMPv6 error pps limitation */
#define ICMPV6CTL_ND6_MAXNUDHINT    15
#define ICMPV6CTL_MTUDISC_HIWAT 16
#define ICMPV6CTL_MTUDISC_LOWAT 17
#define ICMPV6CTL_ND6_DEBUG 18
#define ICMPV6CTL_ND6_DRLIST    19
#define ICMPV6CTL_ND6_PRLIST    20
#define ICMPV6CTL_ND6_MAXQLEN   24
#define ICMPV6CTL_MAXID     25

#define ICMPV6CTL_NAMES { \
    { 0, 0 }, \
    { 0, 0 }, \
    { "rediraccept", CTLTYPE_INT }, \
    { "redirtimeout", CTLTYPE_INT }, \
    { 0, 0 }, \
    { 0, 0 }, \
    { "nd6_prune", CTLTYPE_INT }, \
    { 0, 0 }, \
    { "nd6_delay", CTLTYPE_INT }, \
    { "nd6_umaxtries", CTLTYPE_INT }, \
    { "nd6_mmaxtries", CTLTYPE_INT }, \
    { "nd6_useloopback", CTLTYPE_INT }, \
    { 0, 0 }, \
    { "nodeinfo", CTLTYPE_INT }, \
    { "errppslimit", CTLTYPE_INT }, \
    { "nd6_maxnudhint", CTLTYPE_INT }, \
    { "mtudisc_hiwat", CTLTYPE_INT }, \
    { "mtudisc_lowat", CTLTYPE_INT }, \
    { "nd6_debug", CTLTYPE_INT }, \
    { 0, 0 }, \
    { 0, 0 }, \
    { 0, 0 }, \
    { 0, 0 }, \
    { 0, 0 }, \
    { "nd6_maxqueuelen", CTLTYPE_INT }, \
}

#ifdef _KERNEL
struct  rtentry;
struct  rttimer;
struct  in6_multi;

void    icmp6_init(void);
void    icmp6_paramerror(struct mbuf *, int);
void    icmp6_error(struct mbuf *, int, int, int);
void    icmp6_error2(struct mbuf *, int, int, int, struct ifnet *);
int icmp6_input(struct mbuf **, int *, int);
void    icmp6_fasttimo(void);
void    icmp6_reflect(struct mbuf *, size_t);
void    icmp6_prepare(struct mbuf *);
void    icmp6_redirect_input(struct mbuf *, int);
void    icmp6_redirect_output(struct mbuf *, struct rtentry *);
int icmp6_sysctl(int *, u_int, void *, size_t *, void *, size_t);

void    icmp6_statinc(u_int);

struct  ip6ctlparam;
void    icmp6_mtudisc_update(struct ip6ctlparam *, int);
void    icmp6_mtudisc_callback_register(void (*)(struct in6_addr *));

/* XXX: is this the right place for these macros? */
#define icmp6_ifstat_inc(ifp, tag) \
do {                                \
    if (ifp)                        \
        ((struct in6_ifextra *)((ifp)->if_afdata[AF_INET6]))->icmp6_ifstat->tag++; \
} while (/*CONSTCOND*/ 0)

#define icmp6_ifoutstat_inc(ifp, type, code) \
do { \
        icmp6_ifstat_inc(ifp, ifs6_out_msg); \
        switch(type) { \
         case ICMP6_DST_UNREACH: \
             icmp6_ifstat_inc(ifp, ifs6_out_dstunreach); \
             if (code == ICMP6_DST_UNREACH_ADMIN) \
                 icmp6_ifstat_inc(ifp, ifs6_out_adminprohib); \
             break; \
         case ICMP6_PACKET_TOO_BIG: \
             icmp6_ifstat_inc(ifp, ifs6_out_pkttoobig); \
             break; \
         case ICMP6_TIME_EXCEEDED: \
             icmp6_ifstat_inc(ifp, ifs6_out_timeexceed); \
             break; \
         case ICMP6_PARAM_PROB: \
             icmp6_ifstat_inc(ifp, ifs6_out_paramprob); \
             break; \
         case ICMP6_ECHO_REQUEST: \
             icmp6_ifstat_inc(ifp, ifs6_out_echo); \
             break; \
         case ICMP6_ECHO_REPLY: \
             icmp6_ifstat_inc(ifp, ifs6_out_echoreply); \
             break; \
         case MLD_LISTENER_QUERY: \
             icmp6_ifstat_inc(ifp, ifs6_out_mldquery); \
             break; \
         case MLD_LISTENER_REPORT: \
             icmp6_ifstat_inc(ifp, ifs6_out_mldreport); \
             break; \
         case MLD_LISTENER_DONE: \
             icmp6_ifstat_inc(ifp, ifs6_out_mlddone); \
             break; \
         case ND_ROUTER_SOLICIT: \
             icmp6_ifstat_inc(ifp, ifs6_out_routersolicit); \
             break; \
         case ND_ROUTER_ADVERT: \
             icmp6_ifstat_inc(ifp, ifs6_out_routeradvert); \
             break; \
         case ND_NEIGHBOR_SOLICIT: \
             icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); \
             break; \
         case ND_NEIGHBOR_ADVERT: \
             icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); \
             break; \
         case ND_REDIRECT: \
             icmp6_ifstat_inc(ifp, ifs6_out_redirect); \
             break; \
        } \
} while (/*CONSTCOND*/ 0)

extern int  icmp6_rediraccept;  /* accept/process redirects */
extern int  icmp6_redirtimeout; /* cache time for redirect routes */
#endif /* _KERNEL */

#ifdef ICMP6_STRINGS
/* Info: http://www.iana.org/assignments/icmpv6-parameters */

static const char * const icmp6_type_err[] = {
    "reserved0", "unreach", "packet_too_big", "timxceed", "paramprob",
    NULL
};

static const char * const icmp6_type_info[] = {
    "echo", "echoreply",
    "mcastlistenq", "mcastlistenrep", "mcastlistendone",
    "rtsol", "rtadv", "neighsol", "neighadv", "redirect",
    "routerrenum", "nodeinfoq", "nodeinfor", "invneighsol", "invneighrep",
    "mcastlistenrep2", "haad_req", "haad_rep",
    "mobile_psol", "mobile_padv", "cga_sol", "cga_adv",
    "experimental150", "mcast_rtadv", "mcast_rtsol", "mcast_rtterm",
    "fmipv6_msg", "rpl_control", NULL
};

static const char * const icmp6_code_none[] = { "none", NULL };

static const char * const icmp6_code_unreach[] = {
    "noroute", "admin", "beyondscope", "addr", "port",
    "srcaddr_policy", "reject_route", "source_route_err", NULL
};

static const char * const icmp6_code_timxceed[] = {
    "intrans", "reass", NULL
};

static const char * const icmp6_code_paramprob[] = {
    "hdr_field", "nxthdr_type", "option", NULL
};

/* not all informational icmps that have codes have a names array */
#endif

#endif /* !_NETINET_ICMP6_H_ */
